We have an older receiver that allowed us to get an Al-a-cart plan. It's something like 50 channels with a couple that are paid (on my mothers unit). I like this plan as we don't listen to talk radio so I didn't subscribe to it.
I'll be honest I don't even know what we pay, but when we are traveling I usually have the music on in the background and wouldn't have it any other way. I hate having to try to find a station at every location. Turn on the Sirius and listen to the channel until the music starts to repeat then go to the next channel (we only listen to about 4 of them anyway).